【单选题】The seventh glass of soda that Tim consumes will produce an extra benefit of 10 cents and has an extra cost of zero (Tim is eating at the cafeteria). The cost-benefit principle predicts that Tim will:
A.
realize he has had too much soda to drink and go home.
B.
drink the seventh glass and continue until the marginal benefit of drinking another glass of soda is zero.
【单选题】Sue consumes only sandwiches and soda and is at her best affordable point. The price of a sandwich falls. The substitution effect is that Sue substitutes ________ for ________. The income effect is th...
A.
sandwiches; soda; buys less of both goods
B.
soda; sandwiches; buys more soda and fewer sandwiches
C.
sandwiches; soda; buys more of both goods
D.
soda; sandwiches; buys less soda and more sandwiches